Process to limit the production of flyash by dry bottom boilers
AssigneeConsolidated Natural Gas Service Company, Inc.
InventorsBernard P. Breen, James E. Gabrielson, Robert A. Schrecengost
Life of this patent
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Abstract
In a process to limit the production of flyash by dry bottom boilers, flyash is collected from flue gas using a collector such as an electrostatic precipitator. The collected flyash is carried in a carrier gas stream to which a fuel is added. The stream is introduced into the boiler in a manner to cause the flyash to soften, agglomerate and fall into the bottom ash pit.
Claims26
A process for the reduction of flyash production from a dry bottom boiler of the type firing pulverized coal, the process comprising the steps of:
- (a) collecting the flyash from a collector selected from the group comprising an of an electrostatic precipitator, a baghouse, a cyclone collector, a multiclone collector, a gravity separator and a sharply curved duct;
- (b) removing the flyash in a stream of carrier gas;
- (c) adding a fuel to the stream of carrier gas and flyash;
- and
- (d) introducing the carrier gas, flyash and fuel into the boiler in a manner so that heat from burning the fuel and the heat from at least one of surrounding gas and slag provide energy to heat and soften the flyash so that the softened flyash is agglomerated and falls into a bottom ash pit.
A process for the reduction of flyash production from a dry bottom boiler, the process comprising the steps of:
- (a) collecting the flyash from one of an electrostatic precipitator, a baghouse, a multiclone collector, a gravity separator, and a sharply turning duct;
- (b) removing the flyash in a stream of carrier gas;
- (c) adding a softening agent which is comprised of at least one of a lower melting material and a fluxing material to the stream of carrier gas and flyash;
- (d) introducing the carrier gas, flyash and softening agent into the boiler in a manner so that heat of the boiler will soften the flyash and softening agent;
- (e) directing the stream so the flyash, softening agent and any other solid material will agglomerate;
- and
- (f) discharging the agglomerated flyash with the bottom ash from the furnace bottom.
Dependencies are inferred from the claim text.